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A new method for evaluation of the isothermal conversion curves from the nonisothermal measurements. application in nickel axide reduction kinetics / Borivoj Adnadjevic in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1420–1427 Titre : A new method for evaluation of the isothermal conversion curves from the nonisothermal measurements. application in nickel axide reduction kinetics Type de document : texte imprimé Auteurs : Borivoj Adnadjevic, Auteur ; Bojan Jankovic, Auteur Année de publication : 2009 Article en page(s) : p. 1420–1427 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Metal  oxide  Nickel  oxide  --  reduction  kinetics Résumé : A new method for evaluation of isothermal conversion curves from the experimentally determined nonisothermal conversion curves for the nickel oxide reduction process in hydrogen atmosphere was established. It was concluded that by applying the conventional and proposed prediction methods it was not possible (at Tiso ≤ 300 °C) to calculate the isothermal conversion curves using the experimentally obtained nonisothermal conversion curves for this reduction process. The dependence of the apparent activation energy on the degree of conversion shows that the investigated reduction process is complex under isothermal or nonisothermal conditions. By applying Miura’s procedure, the shape of density distribution functions of the apparent activation energies was determined for the isothermal and nonisothermal reduction processes. It was concluded that the existence of different distributions of internal energy of the NiO reduction centers is a consequence of different reduction kinetics under isothermal and nonisothermal experimental conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801074j [article] A new method for evaluation of the isothermal conversion curves from the nonisothermal measurements. application in nickel axide reduction kinetics [texte imprimé] / Borivoj Adnadjevic, Auteur ; Bojan Jankovic, Auteur . - 2009 . - p. 1420–1427. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1420–1427 Mots-clés : Metal  oxide  Nickel  oxide  --  reduction  kinetics Résumé : A new method for evaluation of isothermal conversion curves from the experimentally determined nonisothermal conversion curves for the nickel oxide reduction process in hydrogen atmosphere was established. It was concluded that by applying the conventional and proposed prediction methods it was not possible (at Tiso ≤ 300 °C) to calculate the isothermal conversion curves using the experimentally obtained nonisothermal conversion curves for this reduction process. The dependence of the apparent activation energy on the degree of conversion shows that the investigated reduction process is complex under isothermal or nonisothermal conditions. By applying Miura’s procedure, the shape of density distribution functions of the apparent activation energies was determined for the isothermal and nonisothermal reduction processes. It was concluded that the existence of different distributions of internal energy of the NiO reduction centers is a consequence of different reduction kinetics under isothermal and nonisothermal experimental conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801074j

The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels / Vesna Panic in Chemical engineering journal, Vol. 156 N° 1 (Janvier 2010) 

Public ISBD [article]  in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 206-214 Titre : The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels Type de document : texte imprimé Auteurs : Vesna Panic, Auteur ; Borivoj Adnadjevic, Auteur ; Sava Velickovic, Auteur Année de publication : 2010 Article en page(s) : pp. 206-214 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Poly  (methacrylic  acid)  hydrogel  Structural  properties  Swelling  kinetics Index. décimale : 660 Résumé : Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (ρxg), the number average molar mass between the network crosslinks (Mc), the crosslink degree (ρc), the number of elastically effective chains totally induced in a perfect network per unit volume (Ve), the distance between the macromolecular chains (ξ) and the equilibrium swelling degree (SDeq) and the swelling kinetics was investigated. As the concentrations of crosslinker, monomer and initiator increase, the value of ρxg, ρc and Ve increases and decreases the value of Mc, ξ and SDeq. With the increase in the neutralization degree of methacrylic acid, the values of ρxg, Mc, ξ, SDeq increase, while the ρc and Ve decrease. The xerogels structural properties, SDeq and swelling kinetic parameters are mainly in power law form functional relationships with the synthesis parameters as well as with the xerogels crosslinking degree. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-7&_user=6 [...] [article] The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels [texte imprimé] / Vesna Panic, Auteur ; Borivoj Adnadjevic, Auteur ; Sava Velickovic, Auteur . - 2010 . - pp. 206-214. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 206-214 Mots-clés : Poly  (methacrylic  acid)  hydrogel  Structural  properties  Swelling  kinetics Index. décimale : 660 Résumé : Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (ρxg), the number average molar mass between the network crosslinks (Mc), the crosslink degree (ρc), the number of elastically effective chains totally induced in a perfect network per unit volume (Ve), the distance between the macromolecular chains (ξ) and the equilibrium swelling degree (SDeq) and the swelling kinetics was investigated. As the concentrations of crosslinker, monomer and initiator increase, the value of ρxg, ρc and Ve increases and decreases the value of Mc, ξ and SDeq. With the increase in the neutralization degree of methacrylic acid, the values of ρxg, Mc, ξ, SDeq increase, while the ρc and Ve decrease. The xerogels structural properties, SDeq and swelling kinetic parameters are mainly in power law form functional relationships with the synthesis parameters as well as with the xerogels crosslinking degree. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-7&_user=6 [...]